FR-4 double-layer PCBs remain one of the most practical choices for rigid board manufacturing. At XinAn PCB, our standard 2-layer FR-4 boards cover thicknesses from 0.4mm to 4.0mm, copper weights from 1oz to 6oz, and large panel sizes up to 650×2000mm. This structure delivers a reliable balance of electrical performance, manufacturability, and cost for consumer electronics, industrial controllers, and LED driver products.
Manufacturing Process and Key Specifications
Our FR-4 double-layer process starts with laminate inspection, CNC drilling, through-hole metallization, outer-layer imaging, etching, solder mask, surface finish, profiling, and 100% electrical verification. The production line supports finished thickness from 0.4mm to 4.0mm, copper weight from 1oz to 6oz, minimum trace/space down to 3/3mil, and multiple surface finishes including HASL, lead-free HASL, ENIG, OSP, immersion silver, and immersion tin.
Material Selection and Design Considerations
This product is positioned on FR-4 only. FR-4 offers a mature balance of mechanical strength, thermal stability, electrical insulation, and process consistency for standard double-sided designs. For most commercial and industrial applications, it is the most dependable base material for keeping stackup control, drill quality, and assembly compatibility in line with production requirements.
Applications and Industry Use Cases
FR-4 double-layer boards are widely used in power modules, LED driver boards, instrumentation, industrial control, communication accessories, and general-purpose embedded electronics. They are especially suitable when the design needs dependable routing density and mechanical reliability without the extra cost of multilayer stackups.
Quality Control and Testing Standards
Every production lot is controlled through AOI, dimensional inspection, process monitoring, and electrical test verification. Depending on customer requirements, XinAn PCB can also support documentation such as material certificates, dimensional inspection reports, and compliance records for downstream assembly or export use.